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The data given below are for the adsorption of nitrogen on alumina at 77.3 K. Show that they fit in a BET isotherm in the range of adsorption and find Vmono and hence surface area of alumina (m2 g-1). At 77.3 K, saturation pressure, P* = 733.59 torr. The volumes are corrected to STP and refer to 1 g of alumina. The area occupied by a nitrogen molecule at -195 °C estimated to be 16.2
x 10-20 m2.
P/ (torr) |
37.67 |
74.20 |
114.54 |
142.0 |
185.34 |
V (cm3 g-1: STP) |
23.14 |
28.1 |
33.1 |
36.35 |
41.49 |